From owner-freebsd-stable@FreeBSD.ORG Wed Nov 17 20:32:16 2004 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8E9916A4CE; Wed, 17 Nov 2004 20:32:16 +0000 (GMT) Received: from ox.eicat.ca (ox.eicat.ca [66.96.30.35]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7BE8C43D49; Wed, 17 Nov 2004 20:32:16 +0000 (GMT) (envelope-from dgilbert@daveg.ca) Received: by ox.eicat.ca (Postfix, from userid 66) id 38F10C86E; Wed, 17 Nov 2004 15:32:16 -0500 (EST) Received: by canoe.dclg.ca (Postfix, from userid 101) id 8ACA967FD; Wed, 17 Nov 2004 15:32:13 -0500 (EST) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16795.46413.508033.379777@canoe.dclg.ca> Date: Wed, 17 Nov 2004 15:32:13 -0500 To: Julian Elischer In-Reply-To: <419BB453.70205@elischer.org> References: <16795.43373.413946.559615@canoe.dclg.ca> <419BB453.70205@elischer.org> X-Mailer: VM 7.17 under 21.5 (beta17) "chayote" (+CVS-20040321) XEmacs Lucid cc: freebsd-hackers@freebsd.org cc: freebsd-stable@freebsd.org cc: David Gilbert Subject: Re: Snapshot corruption. X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Nov 2004 20:32:16 -0000 >>>>> "Julian" == Julian Elischer writes: Julian> David Gilbert wrote: >> I've got a medium busy server (few thousand mail messages a day, >> web, webmail, imap, etc) that I can fairly reliably reproduce >> filesystem corruption by creating multiple snapshots and deleting >> them. >> >> I don't think I'm up to debugging this, but I may be able to >> provide an exercise platform. Julian> can you characterise the corruption? Sure. Typically the system will crash with an ffs panic of some random type. When it comes back, we run non-background fsck's because manual fsck is sometimes required. Corruption varies. Some stuff sometimes pops up in lost+found. Some stuff can vanish (not 100% positive on that). But most worringly, is that some files come back corrupted (ie berkley db files that db won't read). Dave. -- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================